rbsx.de

Checked 22 October 2026, 00:00 UTC · via 8.8.8.8

✗Problems found

9 passed 2 warnings 3 failed 3 info

SPF

fail

No SPF record found

Checks

✗

No SPF record

No SPF record was found for this domain. SPF is important for preventing email spoofing. Add an SPF record to specify which servers are authorized to send email for your domain.

#6

DMARC

fail

No DMARC record found

Checks

✗

No DMARC record

No DMARC record was found for this domain. DMARC is essential for preventing email spoofing. Add a DMARC record with p=reject or at least p=quarantine.

#5

DKIM

fail

No keys found under the checked selectors

Found

Selectors: None found
_domainkey: NXDOMAIN

Checks

✗

No DKIM keys published

_domainkey.rbsx.de does not exist (NXDOMAIN), so no DKIM keys are published. DKIM helps prevent email spoofing. Configure DKIM with your email service provider.

#7

DNSSEC

warn

Not signed

Found

DNSKEY records: No (0)
DS at parent: No

Checks

!

Not enabled

DNSSEC is not enabled for this domain. Consider enabling DNSSEC to protect against DNS spoofing attacks.

#8

MX

pass

2 mail servers

Found

Priority	Host	Records	Reverse DNS
10	mx1.rbsx.de	A 88.198.20.145 AAAA 2a01:4f8:222:2b49:5498:d60a:e248:3219	mx1.checkdomain.de ✓ mx1.checkdomain.de ✓
20	mx2.rbsx.de	A 94.130.12.24 AAAA 2a01:4f8:10b:1067:c61b:626:b6c3:fc60	mx2.checkdomain.de ✓ mx2.checkdomain.de ✓

Checks

✓ 2 MX records #9

Found 2 MX records for this domain.
✓ All hosts resolve #10

All MX records resolve to valid IP addresses.
✓ All hosts have IPv6 #11

All MX records resolve to IPv6 addresses.
✓ Redundant MX hosts #12

Found 2 MX records, which provides redundancy for email delivery.
✓ At most 5 MX records #13

Found 2 MX records, which is within the recommended range (1-5).
✓ No localhost targets #14

No MX records pointing to localhost found.
✓ No private IP addresses #15

No MX records resolving to private IP addresses found.
✓ No CNAME targets #22

No MX records point to a CNAME.
✓ Reverse DNS confirmed #30

All 4 MX addresss have a PTR record that resolves back to them.

TLS

warn

no MTA-STS · no TLS-RPT · DANE on 0 of 2 MX hosts

Found

DANE (TLSA records)

MX host	TLSA	DNSSEC
mx1.rbsx.de	none	-
mx2.rbsx.de	none	-

Checks

!

Not configured

MTA-STS is not configured, so other mail servers fall back to unencrypted delivery when TLS fails or is stripped by an attacker. Publish a _mta-sts TXT record and a policy at https://mta-sts.<domain>/.well-known/mta-sts.txt.

#32
i

Not configured

TLS-RPT lets senders report TLS delivery problems to you. It is most useful together with MTA-STS or DANE.

#35
i

Not used

No MX host publishes TLSA records. DANE lets senders verify your mail server's certificate through DNSSEC; it requires DNSSEC on the MX host's zone.

#36

BIMI

info

No BIMI record

Checks

i

Not configured

BIMI shows your logo next to your mail in supporting mail clients. It requires DMARC enforcement.

#38